Doraemon, a beloved robotic cat from the Japanese manga and anime series of the same name, has done many unique things throughout his adventures. However, one of the most unique things he has done is to use his "Time TV" gadget to bring a famous historical figure, Nobita's great-great-grandfather, to the present day. In the episode titled "Nobita's Great-great-grandson," Doraemon and Nobita travel to the future and meet Nobita's great-great-grandson, who is a renowned inventor. However, when they return to the present day, they find out that the world has been drastically changed because of the disappearance of Nobita's great-great-grandfather from the past. To fix the situation, Doraemon uses the "Time TV" gadget to bring the historical figure to the present day and reunite him with his family. This unique story arc showcases Doraemon's ability to manipulate time and history, while also highlighting the importance of family and legacy.